Pour boiling water over 2 cups all-bran, let cool.,Cream margarine, sugar, add eggs.,______,Add to cream mixture, buttermilk, also add the all-bran mixture and the remaining 4 cups all-bran.,Stir until well blended; do not beat. Must refrigerate before using, fill well-greased muffin tins and bake at 400° for 15 to 20 minutes.,Make only what you need as this batter will keep 4 to 6 weeks.